Have you heard of the ship Wilhelm Gustloff? I have to admit that I hadn't and yet its sinking during WW2 was the deadliest disaster in maritime history.
With WW2 drawing to a close and thousands of East Prussian refugees making a desperate attempt to reach freedom, many are drawn to the ship that offers them salvation, the Wilhelm Gustloff. Ruta Sepetys' story centres on Joana, Emilia and Florian who come together and find themselves in a terrible fight for survival. A riveting historical story, told in alternating points of view.
If you enjoyed Between Shades of Gray and All the Light We Cannot See, Salt to the Sea is definitely for you.
http://www.penguinrandomhouse.com/books/311729/salt-to-the-sea-by-ruta-sepetys/9780399160301